?? build.c
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#include <stdio.h> /* fprintf */#include <stdlib.h> /* contains exit */#include <sys/types.h> /* unistd.h needs this */#include <unistd.h> /* contains read/write */#include <fcntl.h>#define MINIX_HEADER 32#define GCC_HEADER 1024void die(char * str){ fprintf(stderr,"%s\n",str); exit(1);}void usage(void){ die("Usage: build boot system [> image]");}int main(int argc, char ** argv){ int i,c,id; char buf[1024]; if (argc != 3) usage(); for (i=0;i<sizeof buf; i++) buf[i]=0; if ((id=open(argv[1],O_RDONLY,0))<0) die("Unable to open 'boot'"); if (read(id,buf,MINIX_HEADER) != MINIX_HEADER) die("Unable to read header of 'boot'"); if (((long *) buf)[0]!=0x04100301) die("Non-Minix header of 'boot'"); if (((long *) buf)[1]!=MINIX_HEADER) die("Non-Minix header of 'boot'"); if (((long *) buf)[3]!=0) die("Illegal data segment in 'boot'"); if (((long *) buf)[4]!=0) die("Illegal bss in 'boot'"); if (((long *) buf)[5] != 0) die("Non-Minix header of 'boot'"); if (((long *) buf)[7] != 0) die("Illegal symbol table in 'boot'"); i=read(id,buf,sizeof buf); fprintf(stderr,"Boot sector %d bytes.\n",i);// if (i>510)// die("Boot block may not exceed 510 bytes"); buf[510]=0x55; buf[511]=0xAA; i=write(1,buf,512); if (i!=512) die("Write call failed"); close (id); if ((id=open(argv[2],O_RDONLY,0))<0) die("Unable to open 'system'");// if (read(id,buf,GCC_HEADER) != GCC_HEADER)// die("Unable to read header of 'system'");// if (((long *) buf)[5] != 0)// die("Non-GCC header of 'system'"); for (i=0 ; (c=read(id,buf,sizeof buf))>0 ; i+=c ) if (write(1,buf,c)!=c) die("Write call failed"); close(id); fprintf(stderr,"System %d bytes.\n",i); return(0);}?? 快捷鍵說(shuō)明
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